Invitation: “Test a reason, with one changed input.” Prepare: Ordinary F1–F6; change-explorer aid. Selected opportunities: U02 / I01 / I04 / I06; conditional on actual component evidence, not blanket code completion.
Choose and act early · 5 minutes
Return to the ordinary web, not FW-C. Learners choose a hypothetical change: fewer gliders or more monitors. Place/dictate that single condition on their own model. They may choose another safely supported ordinary organism-related condition with a clear baseline assumption.
Set boundaries together · 8 minutes
Ask what is held the same and what “more/fewer” means in the model. No amount or result is supplied. With fewer gliders, caterpillars might face less glider predation, while monitor food may be reduced; these are mechanisms to consider, not guaranteed outcomes. No real organism is manipulated.
Build a model question · 12 minutes
Learner drafts “If ___ changes while ___ stays the same, what might happen to ___ over ___?” They choose an outcome and time frame such as later abundance, with no invented count. Keep one question or causal path now; do not demand a full investigation form. Pause at the split.
Compare two assumptions · 15 minutes
Use two broad versions: caterpillar reproduction/other predators unchanged, versus another pressure not known. Learners trace the same source-supported path in each and decide how certainty changes. They may describe rather than move the model. Name an actual move only if it happened; otherwise retain a comparison plan.
Justify and challenge · 6 minutes
Invite a reason plus a condition, then one question that could change the prediction. Distinguish direct feeding relation from an indirect pathway. Keep increase/decrease/no clear direction open where justified; numbers of arrows do not calculate a percentage loss.
Save a usable note · 4 minutes
Learner chooses a change note for their explainer, perhaps “may increase if ____.” Teacher samples mechanism/condition/help. A hypothesis not enacted is not recorded as a completed experiment.
Practical check: Sample one actual source-connected choice/reason in the chosen mode. Use Day 26 routes, two worked contexts and home/extra invitation only as useful.